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"Doof 101" is the 221st individual episode of Phineas and Ferb, and notably the last standard-length (11 minutes) episode to air. It was released directly-to-video on the Phineas and Ferb: Star Wars DVD before airing on American television in November. It is also the only episode to take place when the characters are at school, though Phineas and Ferb themselves only make a brief cameo in the story.

Summary

Dr. Doofenshmirtz is sentenced to community service for being evil, and much to his daughter Vanessa's chagrin, he is assigned to teach science at her high school. Meanwhile, a trio of bugs embark on a journey to become the first insects to communicate with humans.